Effects of biological crust coverage on soil hydraulic properties for the Loess Plateau of China

doi:10.1002/hyp.11263

	Effects of biological crust coverage on soil hydraulic properties for the Loess Plateau of China
	Wang, Hao 1,2; Zhang, Guanghui 1,2; Liu, Fa 3; Geng, Ren 1,2; Wang, Lunjiang 1,2
刊名	HYDROLOGICAL PROCESSES
	2017-09-15
卷号	31 期号:19 页码:3396-3406
关键词	abandoned farmland biological soil crusts disc infiltrometer soil infiltration the Loess Plateau
ISSN号	0885-6087
DOI	10.1002/hyp.11263
通讯作者	Zhang, Guanghui(ghzhang@bnu.edu.cn)
英文摘要	Biological soil crusts (BSCs) are ubiquitous living covers that have been allowed to grow on abandoned farmlands over the Loess Plateau because the Grain for Green project was implemented in 1999 to control serious soil erosion. However, few studies have been conducted to quantify the effects of BSC coverage on soil hydraulic properties. This study was performed to assess the effects of BSC coverage on soil hydraulic properties, which are reflected by the soil sorptivity under an applied pressure of 0 (S-0) and -3 (S-3)cm, saturated hydraulic conductivity (K-s), wetting front depth (WFD), and mean pore radius ((m)), for the Loess Plateau of China. Five classes of BSC coverage (i.e., 1-20%, 20-40%, 40-60%, 60-80%, and 80-100%) and a bare control were selected at both cyanobacteria- and moss-covered sites to measure soil hydraulic properties using a disc infiltrometer under 2 consecutive pressure heads of 0 and -3cm, allowing the direct calculation of S-0, S-3, K-s, and (m). The WFD was measured onsite using a ruler immediately after the experiments of infiltration. The results indicated that both cyanobacteria and moss crusts were effective in changing the soil properties and impeding soil infiltration. The effects of moss were greater than those of cyanobacteria. Compared to those of the control, the S-0, S-3, K-s, WFD, and (m) values of cyanobacteria-covered soils were reduced by 13.7%, 11.0%, 13.3%, 10.6%, and 12.6% on average, and those of moss-covered soils were reduced by 27.6%, 22.1%, 29.5%, 22.2%, and 25.9%, respectively. The relative soil sorptivity under pressures of 0 (RS0) and -3 (RS3)cm, the relative saturated hydraulic conductivity (RKs), the relative wetting front depth (RWFD), and the relative mean pore radius (R-m) decreased exponentially with coverage for both cyanobacteria- and moss-covered soils. The rates of decrease in RS0, RS3, RKs, RWFD, and R-m of cyanobacteria were significantly slower than those of moss, especially for the coverage of 0-40%, with smaller ranges. The variations of soil hydraulic properties with BSC coverage were closely related to the change in soil clay content driven by the BSC coverage on the Loess Plateau. The results are useful for simulating the hydraulic parameters of BSC-covered soils in arid and semiarid areas.
资助项目	State Key Program of National Natural Science of China[41530858] ; National Key R & D Program of China[2017YFC0504702] ; Fund for Creative Research Groups of the National Natural Science Foundation of China[41621061]
WOS关键词	SEMIARID ECOSYSTEMS ; MICROBIOTIC CRUSTS ; WATER INFILTRATION ; NEGEV DESERT ; SURFACE ; VEGETATION ; CONDUCTIVITY ; LAND ; DISC ; FLOW
WOS研究方向	Water Resources
语种	英语
出版者	WILEY
WOS记录号	WOS:000408341800007
资助机构	State Key Program of National Natural Science of China ; National Key R & D Program of China ; Fund for Creative Research Groups of the National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/61594]
专题	中国科学院地理科学与资源研究所
通讯作者	Zhang, Guanghui
作者单位	1.Beijing Normal Univ, State Key Lab Earth Surface Proc & Resources Ecol, Beijing 100875, Peoples R China 2.Beijing Normal Univ, Fac Geog Sci, Beijing 100875, Peoples R China 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Wang, Hao,Zhang, Guanghui,Liu, Fa,et al. Effects of biological crust coverage on soil hydraulic properties for the Loess Plateau of China[J]. HYDROLOGICAL PROCESSES,2017,31(19):3396-3406.
APA	Wang, Hao,Zhang, Guanghui,Liu, Fa,Geng, Ren,&Wang, Lunjiang.(2017).Effects of biological crust coverage on soil hydraulic properties for the Loess Plateau of China.HYDROLOGICAL PROCESSES,31(19),3396-3406.
MLA	Wang, Hao,et al."Effects of biological crust coverage on soil hydraulic properties for the Loess Plateau of China".HYDROLOGICAL PROCESSES 31.19(2017):3396-3406.